太赫兹光子晶体光纤与天线设计(英文)

Design of terahertz photonic crystal fiber and antenna

以聚甲基丙烯酸甲酯（PMMA）材料为基质,设计了一种空芯多孔包层结构的太赫兹光纤,中心的大孔缺陷用于传输太赫兹波,周围四层小孔可以将太赫兹波的传播限制在缺陷内部。利用COMSOL软件对光纤的损耗特性进行仿真分析发现,光纤在0.6 THz的泄露损耗低于0.1 dB/m,具有良好的传输特性。和金属波导口可以当作天线辐射电磁波的原理相似,光纤的端面也可以作为天线将内部传输的太赫兹波向外辐射,通过仿真分析,天线在0.59~0.61 THz的回波损耗低于-25 dB,方向性系数大于20 dB,半功率波束宽度约为13°。

The design of a hollow-core terahertz photonic crystal fiber（PCF） based on poly methylmethacrylate（PMMA） is reported in this paper. THz wave propagates inside the core large hole and the surrouding four cladding layers with small holes can confine THz wave propagation. By simulation in software COMSOL, the leakage loss of the designed PCF is found to be lower than 0.1 dB /m at 0.6 THz which is low at terahertz band. Similar to the radiation theory of metallic waveguide, the PCF can also be used as antenna to radiate energy. Its radiation characteristics are simulated. The simulated input reflection coefficient is less than-25 dB and the directivity of the antenna is greater than 20 dB. The half power beam width is about 13 degrees.